渭河盆地深大断裂处构造应力特征及其活动特性

发布时间：2018-04-22 06:29

本文选题：渭河盆地 + GPS　；参考：《武汉大学学报(信息科学版)》2017年06期

【摘要】：利用渭河盆地2001~2010年高精度GPS监测资料,采用有限元数值分析法,分析了渭河盆地内深大断裂处的构造应力特征及断裂活动特性。结果表明,盆地西部断裂处均呈现出明显的近E-W(east-west)向挤压应力特征,而盆地中部断裂处则均呈现出显著的NW-SE(northwest-southeast)向拉张应力特征,东部断裂处呈现出一定的NW-SE向拉张应力,但该部量值较中部断裂处小;走向各异的同一条深大断裂不同区段,呈现出的应力特征、量值以及活动速率也存在差异性;跨断裂剖线显示沿断裂走向的速度分量在断裂两侧均发生了一定量值的变化,构造断裂具有一定的扭动特性。模拟计算结果进一步显示盆地中部较东、西部受NW-SE向拉张应力作用显著,且在中部这些具有拉张应力特征的深大断裂交汇处,特别是断裂活动速率较大的区段,正是盆地内地裂缝灾害最为集中发育的区域。
[Abstract]:Based on the high-precision GPS monitoring data of Weihe Basin from 2001 to 2010, the structural stress characteristics and fault activity characteristics of deep and large faults in Weihe Basin are analyzed by using finite element numerical analysis method. The results show that all the faults in the western part of the basin show the characteristics of compressional stress in the near E-WW west direction, while in the central part of the basin, the tensile stress in the NW-SEE northwest-southeastdirection is obvious, and in the eastern fault there is a certain tensile stress in the direction of NW-SE. However, the value of this part is smaller than that of the central fault, and the stress characteristics, the magnitude and the activity rate of the same deep and large fault with different strike are also different. The cross-fault profile shows that the velocity component along the fault strike has changed in a certain amount on both sides of the fault, and the tectonic fault has a certain torsion characteristic. The simulation results further show that the central part of the basin is more eastern, and the west part of the basin is significantly affected by the NW-SE tensile stress, and in the central part of the basin, which has the characteristics of tensile stress, the deep and large fault intersections, especially the section with higher rate of fault activity, are found in the middle part of the basin. It is precisely the area where fracture disasters are most concentrated in the interior of the basin.
【作者单位】：长安大学地质工程与测绘学院;成都理工大学地质灾害防治与地质环境保护国家重点实验室;中国地震局第二监测中心;
【基金】：国家自然科学基金(41674001,41202189,41274005,41504005) 陕西省自然科学基础研究计划(2016JM4005) 地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2014K009) 中国博士后基金(2013M530412) 中央高校基本科研业务费专项资金(2014G1261050,2014G3263014)~~
【分类号】：P228.4;P542

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